Why pure virtual functions are used if they don't have implementation / When does a pure virtual function become useful?

What is virtual destructors? Why they are used?

What you mean by early binding and late binding? How it is related to dynamic binding?

What is meant by reference variable in C++?

How to create a reference variable in C++

What are the difference between reference variables and pointers in C++?

What will the line of code below print out and why?

What is the error in the code below and how should it be corrected?

What will i and j equal after the code below is executed? Explain your answer.

What are the different data types present in C++?

What are class and object in C++?

Compare compile time polymorphism and Runtime polymorphism

What do you know about friend class and friend function?

Define inline function

What is a reference in C++?